I just put a set of 18s on my car and now have a problem in the rear. I'm running toyo t1s 275-35s in the rear on 18x9s. As with all rear independent suspension cars it frog-squats when I launch semi-hard, however the tire rubs. It even rubs when I hit a hard dip in the road as well. the car is dropped on racing beat springs (1-1.5) but it has stock r1 shocks. Any chance by going to 5-ways I can get this to stop? The car does feel real soft in the back. I know a lot of people that run these series tires on 7s without any problems...what should I do?

-chad

 

Rear wheel offsets are probably too small 38-mm or less. Camber might also be too positive. 5-ways won't help.

 

If your shocks are bottoming out because they're extremely worn, new, firmer shocks may help but it's only a band-aid and not a real fix. As Sleep suggested, you may have the wrong offset. 275's are pretty big to be using with full-sized coil springs. I run 265's with full coil-over conversion (2.5"OD springs) and I could run 285's. Check to see where it's hitting/rubbing too. If it's the springs, swapping out a set for say Ground Controls or going with a full, threaded body coil over like the JIC's or Tein's may be a solution as well.
Michel

 

You could roll the fender lip, depending on where it rubs on the tire, otherwise, stiffer rear shocks will stop it, but the car will ride like a buck-board.

 

The 275-35's are a bit taller than the stock 225-50's so that may be one reason. Also depending on where it is rubbing. More specific?

 

I have had 285/30s (on 18X10 +44), 275/35s (18X9.5 +43), and 265/35s (18X9+42) on my rear with stock sized coils, no problems.

SleepR1 is right - this is a stricly wheel offset issue.

 

275/35/18 rear is alittle tall. it sounds like your shocks are worn out. I have 18x9rear with 265/35/18 with Tein HAs and the back is SLAMMED!! I have no issue in rubbing.

good luck